It has been observed that fish with parasites may come to "cleaning stations" in the reef.

Cooperation on other levels, such as at cleaning stations, is well-known.

Cleaner wrasses usually can be found around cleaning stations.

It also cut 42 jobs cleaning stations.

Young blue angelfish eat parasites on other fish at "cleaning stations".

They would clean buses and subway trains and stations.

In many coral reefs, cleaner shrimp congregate at cleaning stations.

These shrimp assemble around cleaning stations where up to 25 shrimp live in proximity.

She learned about "cleaning stations," where tiny fish clean the parasites off larger fish that would otherwise eat them.

Surely what kept them out was the fact that vast crews were employed to clean the tracks, cars and stations.